import datetime as dt

import numpy as np

from holoviews.core.overlay import NdOverlay
from holoviews.element import Dataset, Histogram
from holoviews.operation import histogram
from holoviews.plotting.util import hex2rgb

from .testplot import TestMPLPlot, mpl_renderer


class TestHistogramPlot(TestMPLPlot):

    def test_histogram_datetime64_plot(self):
        dates = np.array([dt.datetime(2017, 1, i) for i in range(1, 5)])
        hist = histogram(Dataset(dates, 'Date'), num_bins=4)
        plot = mpl_renderer.get_plot(hist)
        artist = plot.handles['artist']
        ax = plot.handles['axis']
        self.assertEqual(ax.get_xlim(), (736330.0, 736333.0))
        bounds = [736330.0, 736330.75, 736331.5, 736332.25]
        self.assertEqual([p.get_x() for p in artist.patches], bounds)

    def test_histogram_padding_square(self):
        points = Histogram([(1, 2), (2, -1), (3, 3)]).options(padding=0.1)
        plot = mpl_renderer.get_plot(points)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 0.19999999999999996)
        self.assertEqual(x_range[1], 3.8)
        self.assertEqual(y_range[0], -1.4)
        self.assertEqual(y_range[1], 3.4)

    def test_histogram_padding_square_positive(self):
        points = Histogram([(1, 2), (2, 1), (3, 3)]).options(padding=0.1)
        plot = mpl_renderer.get_plot(points)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 0.19999999999999996)
        self.assertEqual(x_range[1], 3.8)
        self.assertEqual(y_range[0], 0)
        self.assertEqual(y_range[1], 3.2)

    def test_histogram_padding_square_negative(self):
        points = Histogram([(1, -2), (2, -1), (3, -3)]).options(padding=0.1)
        plot = mpl_renderer.get_plot(points)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 0.19999999999999996)
        self.assertEqual(x_range[1], 3.8)
        self.assertEqual(y_range[0], -3.2)
        self.assertEqual(y_range[1], 0)

    def test_histogram_padding_nonsquare(self):
        histogram = Histogram([(1, 2), (2, 1), (3, 3)]).options(padding=0.1, aspect=2)
        plot = mpl_renderer.get_plot(histogram)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 0.35)
        self.assertEqual(x_range[1], 3.65)
        self.assertEqual(y_range[0], 0)
        self.assertEqual(y_range[1], 3.2)

    def test_histogram_padding_logx(self):
        histogram = Histogram([(1, 1), (2, 2), (3,3)]).options(padding=0.1, logx=True)
        plot = mpl_renderer.get_plot(histogram)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 0.41158562699652224)
        self.assertEqual(x_range[1], 4.2518491541367327)
        self.assertEqual(y_range[0], 0)
        self.assertEqual(y_range[1], 3.2)

    def test_histogram_padding_logy(self):
        histogram = Histogram([(1, 2), (2, 1), (3, 3)]).options(padding=0.1, logy=True)
        plot = mpl_renderer.get_plot(histogram)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 0.19999999999999996)
        self.assertEqual(x_range[1], 3.8)
        self.assertEqual(y_range[0], 0.03348369522101712)
        self.assertEqual(y_range[1], 3.3483695221017129)

    def test_histogram_padding_datetime_square(self):
        histogram = Histogram([(np.datetime64('2016-04-0%d' % i, 'ns'), i) for i in range(1, 4)]).options(
            padding=0.1
        )
        plot = mpl_renderer.get_plot(histogram)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 736054.19999999995)
        self.assertEqual(x_range[1], 736057.80000000005)
        self.assertEqual(y_range[0], 0)
        self.assertEqual(y_range[1], 3.2)

    def test_histogram_padding_datetime_nonsquare(self):
        histogram = Histogram([(np.datetime64('2016-04-0%d' % i, 'ns'), i) for i in range(1, 4)]).options(
            padding=0.1, aspect=2
        )
        plot = mpl_renderer.get_plot(histogram)
        x_range, y_range = plot.handles['axis'].get_xlim(), plot.handles['axis'].get_ylim()
        self.assertEqual(x_range[0], 736054.34999999998)
        self.assertEqual(x_range[1], 736057.65000000002)
        self.assertEqual(y_range[0], 0)
        self.assertEqual(y_range[1], 3.2)

    ###########################
    #    Styling mapping      #
    ###########################

    def test_histogram_color_op(self):
        histogram = Histogram([(0, 0, '#000000'), (0, 1, '#FF0000'), (0, 2, '#00FF00')],
                              vdims=['y', 'color']).options(color='color')
        plot = mpl_renderer.get_plot(histogram)
        artist = plot.handles['artist']
        children = artist.get_children()
        for c, w in zip(children, ['#000000', '#FF0000', '#00FF00']):
            self.assertEqual(c.get_facecolor(), tuple(c/255. for c in hex2rgb(w))+(1,))

    def test_histogram_linear_color_op(self):
        histogram = Histogram([(0, 0, 0), (0, 1, 1), (0, 2, 2)],
                              vdims=['y', 'color']).options(color='color')
        with self.assertRaises(Exception):
            mpl_renderer.get_plot(histogram)

    def test_histogram_categorical_color_op(self):
        histogram = Histogram([(0, 0, 'A'), (0, 1, 'B'), (0, 2, 'C')],
                              vdims=['y', 'color']).options(color='color')
        with self.assertRaises(Exception):
            mpl_renderer.get_plot(histogram)
        
    def test_histogram_line_color_op(self):
        histogram = Histogram([(0, 0, '#000'), (0, 1, '#F00'), (0, 2, '#0F0')],
                              vdims=['y', 'color']).options(edgecolor='color')
        with self.assertRaises(Exception):
            mpl_renderer.get_plot(histogram)

    def test_histogram_alpha_op(self):
        histogram = Histogram([(0, 0, 0), (0, 1, 0.2), (0, 2, 0.7)],
                              vdims=['y', 'alpha']).options(alpha='alpha')
        with self.assertRaises(Exception):
            mpl_renderer.get_plot(histogram)

    def test_histogram_line_width_op(self):
        histogram = Histogram([(0, 0, 1), (0, 1, 4), (0, 2, 8)],
                              vdims=['y', 'line_width']).options(linewidth='line_width')
        plot = mpl_renderer.get_plot(histogram)
        artist = plot.handles['artist']
        children = artist.get_children()
        for c, w in zip(children, np.array([1, 4, 8])):
            self.assertEqual(c.get_linewidth(), w)

    def test_op_ndoverlay_value(self):
        colors = ['blue', 'red']
        overlay = NdOverlay({color: Histogram(np.arange(i+2))
                             for i, color in enumerate(colors)}, 'Color').options(
                                     'Histogram', facecolor='Color'
                             )
        plot = mpl_renderer.get_plot(overlay)
        colors = [(0, 0, 1, 1), (1, 0, 0, 1)]
        for subplot, color in zip(plot.subplots.values(),  colors):
            children = subplot.handles['artist'].get_children()
            for c in children:
                self.assertEqual(c.get_facecolor(), color)
